Flask



FIG. 1 is a perspective top view showing the new design for the flask.

FIG. 2 is a front view thereof.

FIG. 3 is a top view thereof.

FIG. 4 is a bottom view thereof.

FIG. 5 is a perspective top view showing an alternative embodiment of the new design for the flask.

FIG. 6 is a front view thereof.

FIG. 7 is a top view thereof.

FIG. 8 is a bottom view thereof.

FIG. 9 is a perspective top view showing an alternative embodiment of the new design for the flask.

FIG. 10 is a front view thereof.

FIG. 11 is a top view thereof.

FIG. 12 is a bottom view thereof.

FIG. 13 is a perspective top view showing an alternative embodiment of the new design for the flask.

FIG. 14 is a front view thereof.

FIG. 15 is top view thereof; and,

FIG. 16 is a bottom view thereof. 

CLAIM The ornamental design for a flask, as shown and described. 